drillio-Mental Math Flash Card 與 フラッシュ暗算（あそんでまなぶ！シリーズ） 使用情況與統計

drillio is an app that allows you to master your mental arithmetic skills. It is perfect for people who want to improve their mental arithmetic skills but don't know what to do. The lessons are divided into small units and are designed to be fun and easy to follow. Even if you are not good at mental arithmetic, you can proceed without feeling like you are studying. No time to waste wondering what to do! Continuation is the most important factor when it comes to mental arithmetic and brain training. To help you continue studying, a 'stats' tab is included to visualize your efforts to keep you motivated. Let's start studying to become a master of mental arithmetic. List of arithmetic operations included ・Addition ・Fill-in addition ・Subtraction ・Multiplication ・Division ・Calculating the remainder after dividing ・Mental math with flashing numbers